US 2009/0243147 A1 · SEPARATOR FOR FUEL CELL AND PRODUCTION METHOD THEREOF

Abstract

A high-performance fuel cell separator ensuring lightweight and compact fabrication necessary to enhance output density and enabling stacking without use of a gas seal member, and a production method thereof, are provided. By a processing method of forming a thermoplastic resin composition highly filled with a carbonaceous material into a thin sheet form, heating the sheet to a melted state, and cold-shaping the melt at a high speed, a thin separator having a corrugated flow path can be molded at a high speed, and a lightweight, compact and high-performance separator for a fuel cell can be provided. Also, by forming the sheet in a multilayer structure and heat-welding it, the contact resistance with the gas diffusing electrode can be reduced, and a compact integrated fuel cell separator requiring no gasket can be provided.

Claims20

Dependent claims

A separator for a fuel cell, comprising an electrically conducting resin composition, and comprising an electrically conducting flow path part;

wherein
the electrically conducting resin composition comprises a carbonaceous material (A) and a thermoplastic resin composition (B) at a mass ratio (A)/(B) of 1 to 20 with a total mass of (A) and (B) accounting for 80 to 100 mass % in the composition;
the electrically conducting flow path part has a corrugated shape having a recess and a projection on each of front and back surfaces thereof, where the recess constitutes a groove for a flow path;
and
the electrically conducting flow path part has a wall thickness of 0.05 to 0.5 mm and a maximum wall thickness/minimum wall thickness ratio of 1 to 3.

2 more elements

Dependencies are inferred from the claim text.

Separator for fuel cell and production method thereof

Life of this patent

Separator for fuel cell and production method thereof

Life of this patent

Abstract

Claims20